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FFmpeg/libavfilter/vf_drawtext.c

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  1. /*

  2.  * Copyright (c) 2011 Stefano Sabatini

  3.  * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram

  4.  * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * drawtext filter, based on the original FFmpeg vhook/drawtext.c

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include <sys/time.h>

  30. #include <time.h>

  31. 

  32. #include "libavutil/colorspace.h"

  33. #include "libavutil/file.h"

  34. #include "libavutil/opt.h"

  35. #include "libavutil/parseutils.h"

  36. #include "libavutil/pixdesc.h"

  37. #include "libavutil/tree.h"

  38. #include "avfilter.h"

  39. #include "drawutils.h"

  40. 

  41. #undef time

  42. 

  43. #include <ft2build.h>

  44. #include <freetype/config/ftheader.h>

  45. #include FT_FREETYPE_H

  46. #include FT_GLYPH_H

  47. 

  48. typedef struct {

  49.     const AVClass *class;

  50.     uint8_t *fontfile;              ///< font to be used

  51.     uint8_t *text;                  ///< text to be drawn

  52.     uint8_t *expanded_text;         ///< used to contain the strftime()-expanded text

  53.     size_t   expanded_text_size;    ///< size in bytes of the expanded_text buffer

  54.     int ft_load_flags;              ///< flags used for loading fonts, see FT_LOAD_*

  55.     FT_Vector *positions;           ///< positions for each element in the text

  56.     size_t nb_positions;            ///< number of elements of positions array

  57.     char *textfile;                 ///< file with text to be drawn

  58.     unsigned int x;                 ///< x position to start drawing text

  59.     unsigned int y;                 ///< y position to start drawing text

  60.     int shadowx, shadowy;

  61.     unsigned int fontsize;          ///< font size to use

  62.     char *fontcolor_string;         ///< font color as string

  63.     char *boxcolor_string;          ///< box color as string

  64.     char *shadowcolor_string;       ///< shadow color as string

  65.     uint8_t fontcolor[4];           ///< foreground color

  66.     uint8_t boxcolor[4];            ///< background color

  67.     uint8_t shadowcolor[4];         ///< shadow color

  68.     uint8_t fontcolor_rgba[4];      ///< foreground color in RGBA

  69.     uint8_t boxcolor_rgba[4];       ///< background color in RGBA

  70.     uint8_t shadowcolor_rgba[4];    ///< shadow color in RGBA

  71. 

  72.     short int draw_box;             ///< draw box around text - true or false

  73.     int use_kerning;                ///< font kerning is used - true/false

  74.     int tabsize;                    ///< tab size

  75. 

  76.     FT_Library library;             ///< freetype font library handle

  77.     FT_Face face;                   ///< freetype font face handle

  78.     struct AVTreeNode *glyphs;      ///< rendered glyphs, stored using the UTF-32 char code

  79.     int hsub, vsub;                 ///< chroma subsampling values

  80.     int is_packed_rgb;

  81.     int pixel_step[4];              ///< distance in bytes between the component of each pixel

  82.     uint8_t rgba_map[4];            ///< map RGBA offsets to the positions in the packed RGBA format

  83.     uint8_t *box_line[4];           ///< line used for filling the box background

  84.     int64_t basetime;               ///< base pts time in the real world for display

  85. } DrawTextContext;

  86. 

  87. #define OFFSET(x) offsetof(DrawTextContext, x)

  88. 

  89. static const AVOption drawtext_options[]= {

  90. {"fontfile", "set font file",        OFFSET(fontfile),           FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  91. {"text",     "set text",             OFFSET(text),               FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  92. {"textfile", "set text file",        OFFSET(textfile),           FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  93. {"fontcolor","set foreground color", OFFSET(fontcolor_string),   FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  94. {"boxcolor", "set box color",        OFFSET(boxcolor_string),    FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  95. {"shadowcolor", "set shadow color",  OFFSET(shadowcolor_string), FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  96. {"box",      "set box",              OFFSET(draw_box),           FF_OPT_TYPE_INT,    {.dbl=0},     0,        1        },

  97. {"fontsize", "set font size",        OFFSET(fontsize),           FF_OPT_TYPE_INT,    {.dbl=16},    1,        72       },

  98. {"x",        "set x",                OFFSET(x),                  FF_OPT_TYPE_INT,    {.dbl=0},     0,        INT_MAX  },

  99. {"y",        "set y",                OFFSET(y),                  FF_OPT_TYPE_INT,    {.dbl=0},     0,        INT_MAX  },

  100. {"shadowx",  "set x",                OFFSET(shadowx),            FF_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  101. {"shadowy",  "set y",                OFFSET(shadowy),            FF_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  102. {"tabsize",  "set tab size",         OFFSET(tabsize),            FF_OPT_TYPE_INT,    {.dbl=4},     0,        INT_MAX  },

  103. {"basetime", "set base time",        OFFSET(basetime),           FF_OPT_TYPE_INT64,  {.dbl=AV_NOPTS_VALUE},     INT64_MIN,        INT64_MAX  },

  104. 

  105. 

  106. /* FT_LOAD_* flags */

  107. {"ft_load_flags", "set font loading flags for libfreetype",   OFFSET(ft_load_flags),  FF_OPT_TYPE_FLAGS,  {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },

  108. {"default",                     "set default",                     0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  109. {"no_scale",                    "set no_scale",                    0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  110. {"no_hinting",                  "set no_hinting",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  111. {"render",                      "set render",                      0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  112. {"no_bitmap",                   "set no_bitmap",                   0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  113. {"vertical_layout",             "set vertical_layout",             0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  114. {"force_autohint",              "set force_autohint",              0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  115. {"crop_bitmap",                 "set crop_bitmap",                 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  116. {"pedantic",                    "set pedantic",                    0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  117. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  118. {"no_recurse",                  "set no_recurse",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  119. {"ignore_transform",            "set ignore_transform",            0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  120. {"monochrome",                  "set monochrome",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  121. {"linear_design",               "set linear_design",               0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  122. {"no_autohint",                 "set no_autohint",                 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  123. {NULL},

  124. };

  125. 

  126. static const char *drawtext_get_name(void *ctx)

  127. {

  128.     return "drawtext";

  129. }

  130. 

  131. static const AVClass drawtext_class = {

  132.     "DrawTextContext",

  133.     drawtext_get_name,

  134.     drawtext_options

  135. };

  136. 

  137. #undef __FTERRORS_H__

  138. #define FT_ERROR_START_LIST {

  139. #define FT_ERRORDEF(e, v, s) { (e), (s) },

  140. #define FT_ERROR_END_LIST { 0, NULL } };

  141. 

  142. struct ft_error

  143. {

  144.     int err;

  145.     const char *err_msg;

  146. } static ft_errors[] =

  147. #include FT_ERRORS_H

  148. 

  149. #define FT_ERRMSG(e) ft_errors[e].err_msg

  150. 

  151. typedef struct {

  152.     FT_Glyph *glyph;

  153.     uint32_t code;

  154.     FT_Bitmap bitmap; ///< array holding bitmaps of font

  155.     FT_BBox bbox;

  156.     int advance;

  157.     int bitmap_left;

  158.     int bitmap_top;

  159. } Glyph;

  160. 

  161. static int glyph_cmp(void *key, const void *b)

  162. {

  163.     const Glyph *a = key, *bb = b;

  164.     int64_t diff = (int64_t)a->code - (int64_t)bb->code;

  165.     return diff > 0 ? 1 : diff < 0 ? -1 : 0;

  166. }

  167. 

  168. /**

  169.  * Load glyphs corresponding to the UTF-32 codepoint code.

  170.  */

  171. static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)

  172. {

  173.     DrawTextContext *dtext = ctx->priv;

  174.     Glyph *glyph;

  175.     struct AVTreeNode *node = NULL;

  176.     int ret;

  177. 

  178.     /* load glyph into dtext->face->glyph */

  179.     if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))

  180.         return AVERROR(EINVAL);

  181. 

  182.     /* save glyph */

  183.     if (!(glyph = av_mallocz(sizeof(*glyph))) ||

  184.         !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {

  185.         ret = AVERROR(ENOMEM);

  186.         goto error;

  187.     }

  188.     glyph->code  = code;

  189. 

  190.     if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {

  191.         ret = AVERROR(EINVAL);

  192.         goto error;

  193.     }

  194. 

  195.     glyph->bitmap      = dtext->face->glyph->bitmap;

  196.     glyph->bitmap_left = dtext->face->glyph->bitmap_left;

  197.     glyph->bitmap_top  = dtext->face->glyph->bitmap_top;

  198.     glyph->advance     = dtext->face->glyph->advance.x >> 6;

  199. 

  200.     /* measure text height to calculate text_height (or the maximum text height) */

  201.     FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);

  202. 

  203.     /* cache the newly created glyph */

  204.     if (!(node = av_mallocz(av_tree_node_size))) {

  205.         ret = AVERROR(ENOMEM);

  206.         goto error;

  207.     }

  208.     av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);

  209. 

  210.     if (glyph_ptr)

  211.         *glyph_ptr = glyph;

  212.     return 0;

  213. 

  214. error:

  215.     if (glyph)

  216.         av_freep(&glyph->glyph);

  217.     av_freep(&glyph);

  218.     av_freep(&node);

  219.     return ret;

  220. }

  221. 

  222. static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)

  223. {

  224.     int err;

  225.     DrawTextContext *dtext = ctx->priv;

  226.     Glyph *glyph;

  227. 

  228.     dtext->class = &drawtext_class;

  229.     av_opt_set_defaults(dtext);

  230.     dtext->fontcolor_string = av_strdup("black");

  231.     dtext->boxcolor_string = av_strdup("white");

  232.     dtext->shadowcolor_string = av_strdup("black");

  233. 

  234.     if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {

  235.         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);

  236.         return err;

  237.     }

  238. 

  239.     if (!dtext->fontfile) {

  240.         av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");

  241.         return AVERROR(EINVAL);

  242.     }

  243. 

  244.     if (dtext->textfile) {

  245.         uint8_t *textbuf;

  246.         size_t textbuf_size;

  247. 

  248.         if (dtext->text) {

  249.             av_log(ctx, AV_LOG_ERROR,

  250.                    "Both text and text file provided. Please provide only one\n");

  251.             return AVERROR(EINVAL);

  252.         }

  253.         if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {

  254.             av_log(ctx, AV_LOG_ERROR,

  255.                    "The text file '%s' could not be read or is empty\n",

  256.                    dtext->textfile);

  257.             return err;

  258.         }

  259. 

  260.         if (!(dtext->text = av_malloc(textbuf_size+1)))

  261.             return AVERROR(ENOMEM);

  262.         memcpy(dtext->text, textbuf, textbuf_size);

  263.         dtext->text[textbuf_size] = 0;

  264.         av_file_unmap(textbuf, textbuf_size);

  265.     }

  266. 

  267.     if (!dtext->text) {

  268.         av_log(ctx, AV_LOG_ERROR,

  269.                "Either text or a valid file must be provided\n");

  270.         return AVERROR(EINVAL);

  271.     }

  272. 

  273.     if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {

  274.         av_log(ctx, AV_LOG_ERROR,

  275.                "Invalid font color '%s'\n", dtext->fontcolor_string);

  276.         return err;

  277.     }

  278. 

  279.     if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {

  280.         av_log(ctx, AV_LOG_ERROR,

  281.                "Invalid box color '%s'\n", dtext->boxcolor_string);

  282.         return err;

  283.     }

  284. 

  285.     if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {

  286.         av_log(ctx, AV_LOG_ERROR,

  287.                "Invalid shadow color '%s'\n", dtext->shadowcolor_string);

  288.         return err;

  289.     }

  290. 

  291.     if ((err = FT_Init_FreeType(&(dtext->library)))) {

  292.         av_log(ctx, AV_LOG_ERROR,

  293.                "Could not load FreeType: %s\n", FT_ERRMSG(err));

  294.         return AVERROR(EINVAL);

  295.     }

  296. 

  297.     /* load the face, and set up the encoding, which is by default UTF-8 */

  298.     if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {

  299.         av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",

  300.                dtext->fontfile, FT_ERRMSG(err));

  301.         return AVERROR(EINVAL);

  302.     }

  303.     if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {

  304.         av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",

  305.                dtext->fontsize, FT_ERRMSG(err));

  306.         return AVERROR(EINVAL);

  307.     }

  308. 

  309.     dtext->use_kerning = FT_HAS_KERNING(dtext->face);

  310. 

  311.     /* load the fallback glyph with code 0 */

  312.     load_glyph(ctx, NULL, 0);

  313. 

  314.     /* set the tabsize in pixels */

  315.     if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {

  316.         av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");

  317.         return err;

  318.     }

  319.     dtext->tabsize *= glyph->advance;

  320. 

  321.     return 0;

  322. }

  323. 

  324. static int query_formats(AVFilterContext *ctx)

  325. {

  326.     static const enum PixelFormat pix_fmts[] = {

  327.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  328.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  329.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  330.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  331.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  332.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  333.         PIX_FMT_NONE

  334.     };

  335. 

  336.     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

  337.     return 0;

  338. }

  339. 

  340. static int glyph_enu_free(void *opaque, void *elem)

  341. {

  342.     av_free(elem);

  343.     return 0;

  344. }

  345. 

  346. static av_cold void uninit(AVFilterContext *ctx)

  347. {

  348.     DrawTextContext *dtext = ctx->priv;

  349.     int i;

  350. 

  351.     av_freep(&dtext->fontfile);

  352.     av_freep(&dtext->text);

  353.     av_freep(&dtext->expanded_text);

  354.     av_freep(&dtext->fontcolor_string);

  355.     av_freep(&dtext->boxcolor_string);

  356.     av_freep(&dtext->positions);

  357.     dtext->nb_positions = 0;

  358.     av_freep(&dtext->shadowcolor_string);

  359.     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);

  360.     av_tree_destroy(dtext->glyphs);

  361.     dtext->glyphs = 0;

  362.     FT_Done_Face(dtext->face);

  363.     FT_Done_FreeType(dtext->library);

  364. 

  365.     for (i = 0; i < 4; i++) {

  366.         av_freep(&dtext->box_line[i]);

  367.         dtext->pixel_step[i] = 0;

  368.     }

  369. 

  370. }

  371. 

  372. static int config_input(AVFilterLink *inlink)

  373. {

  374.     DrawTextContext *dtext = inlink->dst->priv;

  375.     const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];

  376.     int ret;

  377. 

  378.     dtext->hsub = pix_desc->log2_chroma_w;

  379.     dtext->vsub = pix_desc->log2_chroma_h;

  380. 

  381.     if ((ret =

  382.          ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,

  383.                                  inlink->w, dtext->boxcolor,

  384.                                  inlink->format, dtext->boxcolor_rgba,

  385.                                  &dtext->is_packed_rgb, dtext->rgba_map)) < 0)

  386.         return ret;

  387. 

  388.     if (!dtext->is_packed_rgb) {

  389.         uint8_t *rgba = dtext->fontcolor_rgba;

  390.         dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  391.         dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  392.         dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

  393.         dtext->fontcolor[3] = rgba[3];

  394.         rgba = dtext->shadowcolor_rgba;

  395.         dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  396.         dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  397.         dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

  398.         dtext->shadowcolor[3] = rgba[3];

  399.     }

  400. 

  401.     return 0;

  402. }

  403. 

  404. static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)

  405. {

  406.     if(!strcmp(cmd, "reinit")){

  407.         int ret;

  408.         uninit(ctx);

  409.         if((ret=init(ctx, arg, NULL)) < 0)

  410.             return ret;

  411.         return config_input(ctx->inputs[0]);

  412.     }

  413. 

  414.     return AVERROR(ENOSYS);

  415. }

  416. 

  417. #define GET_BITMAP_VAL(r, c)                                            \

  418.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

  419.         (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \

  420.          bitmap->buffer[(r) * bitmap->pitch +  (c)]

  421. 

  422. #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \

  423.     luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \

  424.     alpha = yuva_color[3] * (val) * 129;                               \

  425.     picref->data[0][luma_pos]    = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos]   ) >> 23; \

  426.     if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\

  427.         chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \

  428.         chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \

  429.         picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \

  430.         picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \

  431.     }\

  432. }

  433. 

  434. static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,

  435.                                  unsigned int y, unsigned int width, unsigned int height,

  436.                                  const uint8_t yuva_color[4], int hsub, int vsub)

  437. {

  438.     int r, c, alpha;

  439.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  440.     uint8_t src_val;

  441. 

  442.     for (r = 0; r < bitmap->rows && r+y < height; r++) {

  443.         for (c = 0; c < bitmap->width && c+x < width; c++) {

  444.             /* get intensity value in the glyph bitmap (source) */

  445.             src_val = GET_BITMAP_VAL(r, c);

  446.             if (!src_val)

  447.                 continue;

  448. 

  449.             SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);

  450.         }

  451.     }

  452. 

  453.     return 0;

  454. }

  455. 

  456. #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \

  457.     p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \

  458.     alpha = rgba_color[3] * (val) * 129;                              \

  459.     *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \

  460.     *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \

  461.     *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \

  462. }

  463. 

  464. static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,

  465.                                  unsigned int x, unsigned int y,

  466.                                  unsigned int width, unsigned int height, int pixel_step,

  467.                                  const uint8_t rgba_color[4], const uint8_t rgba_map[4])

  468. {

  469.     int r, c, alpha;

  470.     uint8_t *p;

  471.     uint8_t src_val;

  472. 

  473.     for (r = 0; r < bitmap->rows && r+y < height; r++) {

  474.         for (c = 0; c < bitmap->width && c+x < width; c++) {

  475.             /* get intensity value in the glyph bitmap (source) */

  476.             src_val = GET_BITMAP_VAL(r, c);

  477.             if (!src_val)

  478.                 continue;

  479. 

  480.             SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,

  481.                           rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);

  482.         }

  483.     }

  484. 

  485.     return 0;

  486. }

  487. 

  488. static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,

  489.                            unsigned int width, unsigned int height,

  490.                            uint8_t *line[4], int pixel_step[4], uint8_t color[4],

  491.                            int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])

  492. {

  493.     int i, j, alpha;

  494. 

  495.     if (color[3] != 0xFF) {

  496.         if (is_rgba_packed) {

  497.             uint8_t *p;

  498.             for (j = 0; j < height; j++)

  499.                 for (i = 0; i < width; i++)

  500.                     SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],

  501.                                   rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);

  502.         } else {

  503.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

  504.             for (j = 0; j < height; j++)

  505.                 for (i = 0; i < width; i++)

  506.                     SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);

  507.         }

  508.     } else {

  509.         ff_draw_rectangle(picref->data, picref->linesize,

  510.                           line, pixel_step, hsub, vsub,

  511.                           x, y, width, height);

  512.     }

  513. }

  514. 

  515. static inline int is_newline(uint32_t c)

  516. {

  517.     return (c == '\n' || c == '\r' || c == '\f' || c == '\v');

  518. }

  519. 

  520. static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,

  521.                        int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)

  522. {

  523.     char *text = dtext->expanded_text;

  524.     uint32_t code = 0;

  525.     int i;

  526.     uint8_t *p;

  527.     Glyph *glyph = NULL;

  528. 

  529.     for (i = 0, p = text; *p; i++) {

  530.         Glyph dummy = { 0 };

  531.         GET_UTF8(code, *p++, continue;);

  532. 

  533.         /* skip new line chars, just go to new line */

  534.         if (code == '\n' || code == '\r' || code == '\t')

  535.             continue;

  536. 

  537.         dummy.code = code;

  538.         glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);

  539. 

  540.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  541.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  542.             return AVERROR(EINVAL);

  543. 

  544.         if (dtext->is_packed_rgb) {

  545.             draw_glyph_rgb(picref, &glyph->bitmap,

  546.                            dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,

  547.                            dtext->pixel_step[0], rgbcolor, dtext->rgba_map);

  548.         } else {

  549.             draw_glyph_yuv(picref, &glyph->bitmap,

  550.                            dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,

  551.                            yuvcolor, dtext->hsub, dtext->vsub);

  552.         }

  553.     }

  554. 

  555.     return 0;

  556. }

  557. 

  558. static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,

  559.                      int width, int height)

  560. {

  561.     DrawTextContext *dtext = ctx->priv;

  562.     uint32_t code = 0, prev_code = 0;

  563.     int x = 0, y = 0, i = 0, ret;

  564.     int text_height, baseline;

  565.     char *text = dtext->text;

  566.     uint8_t *p;

  567.     int str_w = 0, len;

  568.     int y_min = 32000, y_max = -32000;

  569.     FT_Vector delta;

  570.     Glyph *glyph = NULL, *prev_glyph = NULL;

  571.     Glyph dummy = { 0 };

  572. 

  573.     time_t now = time(0);

  574.     struct tm ltime;

  575.     uint8_t *buf = dtext->expanded_text;

  576.     int buf_size = dtext->expanded_text_size;

  577. 

  578.     if(dtext->basetime != AV_NOPTS_VALUE)

  579.         now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;

  580. 

  581.     if (!buf) {

  582.         buf_size = 2*strlen(dtext->text)+1;

  583.         buf = av_malloc(buf_size);

  584.     }

  585. 

  586. #if HAVE_LOCALTIME_R

  587.     localtime_r(&now, &ltime);

  588. #else

  589.     if(strchr(dtext->text, '%'))

  590.         ltime= *localtime(&now);

  591. #endif

  592. 

  593.     do {

  594.         *buf = 1;

  595.         if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)

  596.             break;

  597.         buf_size *= 2;

  598.     } while ((buf = av_realloc(buf, buf_size)));

  599. 

  600.     if (!buf)

  601.         return AVERROR(ENOMEM);

  602.     text = dtext->expanded_text = buf;

  603.     dtext->expanded_text_size = buf_size;

  604.     if ((len = strlen(text)) > dtext->nb_positions) {

  605.         if (!(dtext->positions =

  606.               av_realloc(dtext->positions, len*sizeof(*dtext->positions))))

  607.             return AVERROR(ENOMEM);

  608.         dtext->nb_positions = len;

  609.     }

  610. 

  611.     x = dtext->x;

  612.     y = dtext->y;

  613. 

  614.     /* load and cache glyphs */

  615.     for (i = 0, p = text; *p; i++) {

  616.         GET_UTF8(code, *p++, continue;);

  617. 

  618.         /* get glyph */

  619.         dummy.code = code;

  620.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  621.         if (!glyph)

  622.             load_glyph(ctx, &glyph, code);

  623. 

  624.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  625.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  626.     }

  627.     text_height = y_max - y_min;

  628.     baseline    = y_max;

  629. 

  630.     /* compute and save position for each glyph */

  631.     glyph = NULL;

  632.     for (i = 0, p = text; *p; i++) {

  633.         GET_UTF8(code, *p++, continue;);

  634. 

  635.         /* skip the \n in the sequence \r\n */

  636.         if (prev_code == '\r' && code == '\n')

  637.             continue;

  638. 

  639.         prev_code = code;

  640.         if (is_newline(code)) {

  641.             str_w = FFMAX(str_w, x - dtext->x);

  642.             y += text_height;

  643.             x = dtext->x;

  644.             continue;

  645.         }

  646. 

  647.         /* get glyph */

  648.         prev_glyph = glyph;

  649.         dummy.code = code;

  650.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  651. 

  652.         /* kerning */

  653.         if (dtext->use_kerning && prev_glyph && glyph->code) {

  654.             FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,

  655.                            ft_kerning_default, &delta);

  656.             x += delta.x >> 6;

  657.         }

  658. 

  659.         if (x + glyph->bbox.xMax >= width) {

  660.             str_w = FFMAX(str_w, x - dtext->x);

  661.             y += text_height;

  662.             x = dtext->x;

  663.         }

  664. 

  665.         /* save position */

  666.         dtext->positions[i].x = x + glyph->bitmap_left;

  667.         dtext->positions[i].y = y - glyph->bitmap_top + baseline;

  668.         if (code == '\t') x  = (x / dtext->tabsize + 1)*dtext->tabsize;

  669.         else              x += glyph->advance;

  670.     }

  671. 

  672.     str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x));

  673.     y     = FFMIN(y + text_height, height - 1);

  674. 

  675.     /* draw box */

  676.     if (dtext->draw_box)

  677.         drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y,

  678.                 dtext->box_line, dtext->pixel_step, dtext->boxcolor,

  679.                 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);

  680. 

  681.     if (dtext->shadowx || dtext->shadowy) {

  682.         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,

  683.                                dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)

  684.             return ret;

  685.     }

  686. 

  687.     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,

  688.                            dtext->fontcolor, 0, 0)) < 0)

  689.         return ret;

  690. 

  691.     return 0;

  692. }

  693. 

  694. static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }

  695. 

  696. static void end_frame(AVFilterLink *inlink)

  697. {

  698.     AVFilterLink *outlink = inlink->dst->outputs[0];

  699.     AVFilterBufferRef *picref = inlink->cur_buf;

  700. 

  701.     draw_text(inlink->dst, picref, picref->video->w, picref->video->h);

  702. 

  703.     avfilter_draw_slice(outlink, 0, picref->video->h, 1);

  704.     avfilter_end_frame(outlink);

  705. }

  706. 

  707. AVFilter avfilter_vf_drawtext = {

  708.     .name          = "drawtext",

  709.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  710.     .priv_size     = sizeof(DrawTextContext),

  711.     .init          = init,

  712.     .uninit        = uninit,

  713.     .query_formats = query_formats,

  714. 

  715.     .inputs    = (AVFilterPad[]) {{ .name             = "default",

  716.                                     .type             = AVMEDIA_TYPE_VIDEO,

  717.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  718.                                     .start_frame      = avfilter_null_start_frame,

  719.                                     .draw_slice       = null_draw_slice,

  720.                                     .end_frame        = end_frame,

  721.                                     .config_props     = config_input,

  722.                                     .min_perms        = AV_PERM_WRITE |

  723.                                                         AV_PERM_READ,

  724.                                     .rej_perms        = AV_PERM_PRESERVE },

  725.                                   { .name = NULL}},

  726.     .outputs   = (AVFilterPad[]) {{ .name             = "default",

  727.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  728.                                   { .name = NULL}},

  729.     .process_command = command,

  730. };